SE444209B

SE444209B - A wing for a propeller

Info

Publication number: SE444209B
Application number: SE7809627A
Authority: SE
Inventors: Nils Ivar Agne Lorentzon
Original assignee: Nils Ivar Agne Lorentzon
Priority date: 1978-09-13
Filing date: 1978-09-13
Publication date: 1986-03-24
Also published as: SE7809627L

Abstract

The invention concerns a wing for a propeller, preferably for wind power motion, whereby the wing consists of two or more secondary wings in the form of elongated blades. The innovative feature of the invention is that the blades (1) which form the wing are rounded and project from each other in sequence, set in the direction of the propeller axle and connected to each other via a series of permanent stays which are distributed according to the wingspan (2).<IMAGE>

Description

: a ä I: a ; 7809627-s 2 lU IS vingar projiceras mot vindriktningen, medan de övriga vingarna "skyms" av den ledande vingen i respektive blad. : a ä I: a; 7809627-s 2 lU IS wings are projected against the wind direction, while the other wings are "obscured" by the leading wing in the respective blades.

Med föreliggande uppfinning såsom denna framstår i patentkravens kännetecknande delar, är avsikten den att åstadkomma en mycket lätt vinge som uppvisar mycket stor hñllfasthet, samtidigt som vingen projicerar maximal yta mot vindriktningen. Härigenom ástadkommes en propeller med relativt små massor, vilken snabbt accelererar till drift- varvtal och som därmed är fäljsam för varierande vindar.With the present invention as it appears in the characterizing parts of the claims, the intention is to provide a very light wing which has a very high strength, at the same time as the wing projects maximum surface in the wind direction. This results in a propeller with relatively small masses, which accelerates rapidly to operating speeds and is thus resilient to varying winds.

Verkningsgraden blir mycket hög.The efficiency will be very high.

Uppfinningen kommer närmare att beskrivas i form av exempel under hänvisning till ritningen, vari fig. 1, 2 och § visar tre olika utföringsformer av en vinge sedd i längd- snitt och vinkelrätt mot bladen, fig. 4, 5 och 6 visar tvärsnitt genom vingar med olika utföríngsformer och i större skala och fig. 7, 8 och 9 visar de bladen förbindande mellanstöden i tva olika utföríngsformer.The invention will be described in more detail by way of example with reference to the drawing, in which Figs. 1, 2 and § show three different embodiments of a wing seen in longitudinal section and perpendicular to the leaves, Figs. 4, 5 and 6 show cross-sections through wings with different embodiments and on a larger scale and Figs. 7, 8 and 9 show the blades connecting the intermediate supports in two different embodiments.

I fig. l betecknar 1 de i varje vinge ingående bladen, vilka medelst mellanstöd 2 är förbundna med varandra för att bilda en styv enhet. Bladroten 3 är avsedd att vridbart fästas vid propellerns nav. Som framgår av fig. l avsmalnar vingcn mot spetsen. Av fíg. 4, 5 och 6 framgår att respek- tive i vingen ingående blad är förbundet med intilliggande blad med hjälp av mellanstödet 2 på så sätt, att bladen huvudsakligen kommer att ligga parallellt med varandra. Som framgår av fig. 4 kan varje blad vara böjt, sett i tvärsnitt, så att den aerodynamiska strömningen omkring bladet vid dettas rotation blir optimal. I fig. 5 visas bladen anord- nade parallellt med varandra, set i tvärsnitt genom vingen, och i fig. 6 något vridna, vinkelställda, i förhållande till varandra. Vid vindmotorn antas anblâsningsríktningen exempelvis vara fran vänster, snett nedifrån.In Fig. 1, 1 denotes the blades included in each wing, which by means of intermediate supports 2 are connected to each other to form a rigid unit. The blade root 3 is intended to be rotatably attached to the hub of the propeller. As can be seen from Fig. 1, the wing tapers towards the tip. Av fig. 4, 5 and 6 it appears that the respective blades included in the wing are connected to adjacent blades by means of the intermediate support 2 in such a way that the blades will lie substantially parallel to each other. As can be seen from Fig. 4, each blade can be bent, seen in cross section, so that the aerodynamic flow around the blade upon its rotation becomes optimal. Fig. 5 shows the blades arranged parallel to each other, seen in cross section through the wing, and in Fig. 6 slightly turned, angled, in relation to each other. In the case of the wind engine, it is assumed that the blowing direction is, for example, from the left, obliquely from below.

Fig. 2 visar en vinge med flera blad än vingen enligt fig. 1 och visas i fig. 3 en vinge med fem stycken blad, vilka är höjda, så att vingen avsmalnar vid rot och spets.Fig. 2 shows a wing with more leaves than the wing according to Fig. 1 and Fig. 3 shows a wing with five leaves, which are raised so that the wing tapers at the root and tip.

Mellanstöden 2 kan ha formen av skivor eller platar, förbindande bladen med varandra. Mellanstöden är anordnade på jämna mellanrum utefter vingens längd. Som framgår av fig. " kan lämpligen dessa mellanstöd vara höjda med krök~ aawaaaawa a: _ »_ Mf- x I ningscentrum i propellerns rotationscentrum (streckat an- av P å ä g r , 1,11 _ ,__M_______ 7809627-8 tytt i fig. 7). På grund av att luften, vid propellerns rotaf tion och därmed vingens rörelse, av centrifugalkraften rör sig utåt vid strömningen genom vingen, dvs. mellanrummet mellan bladen, är lämpligen dock den bakre kanten 4 av mellanstödet förlagd på längre avstånd från rotationscentrum än stödets främre kant. Härigenem erhålles en bättre ström- ning genom propellervíngen. I fig. 8 och 9 visas ett mellan- stöd i form av en aeredynamiskt formad sträva och i fig. 9 visas denna i snitt A-A i fig. 8.The intermediate supports 2 may be in the form of discs or plates, connecting the blades to each other. The intermediate supports are arranged at regular intervals along the length of the wing. As can be seen from FIG. Fig. 7) Due to the fact that the air, during the rotation of the propeller and thus the movement of the blade, moves outwards by the centrifugal force during the flow through the blade, i.e. the space between the blades, the rear edge 4 of the intermediate support is suitably spaced from center of rotation than the front edge of the support, thereby obtaining a better flow through the propeller wing, Figs. 8 and 9 show an intermediate support in the form of an aeredynamically shaped strut, and Fig. 9 shows this in section AA in Fig. 8.

Genom vingens fackverkskonstruktion kan resp. blad fram» ställas av lätta material med mindre krav pà hög hållfast- het, exempelvis plast eller plywood.Through the wing's truss construction, resp. sheets are made of lightweight materials with less demands on high strength, such as plastic or plywood.

Mcllanstödens lägen längs Vingen kan självfallet in- hördes varieras beroende på vingform och beräknade krafter, verkande på vingen.The positions of the Mcllan supports along the wing can of course be heard, depending on the shape of the wing and the calculated forces acting on the wing.

Beroende på avsedda varvtal, vindfo.nållanden etc. kan bladen förskjutas och lutas relativt varandra mer eller mindre inbördes variera med avseende på tjocklek, bredd och längd, utan att därmed frángå uppfinningens grundtanke, att sammansatta en propellervinge med hjälp av blad, placerade såsom framgår av ovan. r:§.'l3.'.fâ,fšal§~$'~íf t i ' HDepending on the intended speeds, wind speeds, etc., the blades can be displaced and inclined relative to each other more or less mutually with respect to thickness, width and length, without departing from the basic idea of the invention, to assemble a propeller blade by means of blades placed as shown of above. r: §.'l3. '. fâ, fšal§ ~ $' ~ íf t i 'H

Claims

W.- _.-_ v .... e ,, ._ '. .M __...... au a, __...._ __., _. _ _. . ,, ._ _ .. ,, e __, ....-..., .. ~ a .-- q '.- ~ "år 7809627-e” “' i * f Å Patentkrav

A blade for a propeller, preferably for wind turbines, the blade consisting of two or more secondary blades in the form of elongate blades, characterized in that the blades (1) forming the independent blade are disc-shaped and arranged one after the other and offset in relation to each other, seen in the direction of the propeller shaft and connected to each other by means of a plurality of fixed intermediate supports distributed along the span of the wing (2).

Wing according to claim 1, characterized in that the first blade seen in the direction of rotation is in the wind direction seen upstream of the other blades in the wing.

Wing according to claim 1, characterized in that the first blade seen in the direction of rotation is in the wind direction seen downstream of the other blades in the wing. _ V

J. Wing according to claim 1, 2 or 3, characterized in that the blades have a curved profile in cross section. in

Wing according to Claim 1, 2 or 3, characterized in that the blades have a flat profile in cross section.

Wing according to one of the preceding claims, characterized in that the blade-forming blades in cross section form an angle with one another.

Wing according to one of the preceding claims, characterized in that the intermediate supports have the shape of arcuate discs, the rear edges of which, seen in the direction of movement of the wing, are at a longer distance from the axis of rotation of the wing than the front edges of the discs.